Sulphur Dioxide 0.5/a, 1 - 25 PPM / 0.5 - 5 PPM, Part # 6728491, 10 Tests 

Application Range

Use in MultiTest med. Int.

Standard Measuring Range: 1 to 25 ppm / 0.25 to 1 ppm

Test Volume: 1 L / 2 L

Flow Rate: 0.2 L / 0.2 L / min

Time for Measurement: 5 min / 10 min

Standard Deviation: ± 25 %

Color Change: greyblue š white

Ambient Operating Conditions

Temperature: 15 to 30 °C

Absolute Humidity: max. 20 mg H2O / L

Pressure: The tube may only be used for depressurized compressed air

Reaction Principle

Starch SO2 + I2 + 2 H2O š H2SO4 + 2 HI

Cross Sensitivity

Hydrogen sulfide is indicated as well but with different sensitivity. Nitrogen dioxide will shorten the reading.

Evaluation

Measuring range 1 to 25 ppm:                    Reading on the (n=10) scale = ppm

Measuring range 0.25 to 1 ppm:                 Reading on the (n= 20) scale x 0.5 = ppm                                                                             SO2 (applies only for scale range

0.5                                                                                     to 2 ppm)